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<?php
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/**
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 * Microsoft's proprietary filter: CSS property
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 * @note Currently supports the alpha filter. In the future, this will
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 *       probably need an extensible framework
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 */
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class HTMLPurifier_AttrDef_CSS_Filter extends HTMLPurifier_AttrDef
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{
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    /**
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     * @type HTMLPurifier_AttrDef_Integer
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     */
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    protected $intValidator;
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    public function __construct()
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    {
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        $this->intValidator = new HTMLPurifier_AttrDef_Integer();
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    }
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    /**
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     * @param string $value
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     * @param HTMLPurifier_Config $config
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     * @param HTMLPurifier_Context $context
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     * @return bool|string
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     */
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    public function validate($value, $config, $context)
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    {
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        $value = $this->parseCDATA($value);
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        if ($value === 'none') {
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            return $value;
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        }
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        // if we looped this we could support multiple filters
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        $function_length = strcspn($value, '(');
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        $function = trim(substr($value, 0, $function_length));
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        if ($function !== 'alpha' &&
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            $function !== 'Alpha' &&
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            $function !== 'progid:DXImageTransform.Microsoft.Alpha'
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        ) {
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            return false;
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        }
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        $cursor = $function_length + 1;
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        $parameters_length = strcspn($value, ')', $cursor);
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        $parameters = substr($value, $cursor, $parameters_length);
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        $params = explode(',', $parameters);
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        $ret_params = array();
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        $lookup = array();
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        foreach ($params as $param) {
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            list($key, $value) = explode('=', $param);
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            $key = trim($key);
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            $value = trim($value);
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            if (isset($lookup[$key])) {
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                continue;
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            }
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            if ($key !== 'opacity') {
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                continue;
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            }
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            $value = $this->intValidator->validate($value, $config, $context);
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            if ($value === false) {
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                continue;
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            }
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            $int = (int)$value;
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            if ($int > 100) {
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                $value = '100';
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            }
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            if ($int < 0) {
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                $value = '0';
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            }
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            $ret_params[] = "$key=$value";
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            $lookup[$key] = true;
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        }
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        $ret_parameters = implode(',', $ret_params);
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        $ret_function = "$function($ret_parameters)";
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        return $ret_function;
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    }
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}
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// vim: et sw=4 sts=4